Abstract: An extendible bumper for an extendible tilt bed roll off truck is pivotally attached to a single hydraulic cylinder which is pivotally attached to the truck frame. The hydraulic cylinder is centrally positioned on the extendible bumper. A pair of guide rods extend from the extendible bumper and telescope into and out of a pair of guide rod holders, one on each side of the hydraulic cylinder. Because the bumper assembly is attached to the truck frame as opposed to the extendible tilt bed, the assembly is provided with a certain amount of clearance before the bumper requires retraction. Indication means for indicating when the extendible bumper is in its fully retracted position may be provided by an indicator switch which becomes depressed when the extendible bumper abuts the truck's stationary bumper. The depressed indicator switch actuates a cab indicator light for indicating full retraction.